| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the tip part of a cold rolled sheet from generating defective winding on a tension reel, which is caused by buckling, and to prevent threading workability in a next process from being impeded by setting the plate thickness of the rear end part of a preceding steel strip or that of the tip part of a succeeding steel strip to be thicker than a target finish plate thickness by a specific quantity, and finishing the steel strip. SOLUTION: By setting the thickness of the tip part of the preceding material A to be rolled in rolling stands #1 to #5 and that of the tip part over 5 to 100 m in length of the succeeding material B to be rolled to be thicker than the target finish plate thickness by 20 to 200μm by a roll gap setting devices 11 to 15, and finish rolling is performed. By this control thickening these plate thickness, the shortages of the rigidity of the tip part and the rear end part of a cold rolled steel strip whose finish plate thickness is <=0.4 mm, are dissolved. Roll drive motors M1 to M5 are controlled by roll speed setting devices 21 to 25 so that tension to be inputted from each tension meter 40 provided between the rolling stands #1 to #5, is in a set limit tension range, the roll speeds of the rolling stands #1 to #5 are controlled to values obtained by adding change quantities to a target roll speed, and the control for thickening is performed to the rear end parts or the tip parts of the materials.</p> |
